Ventilation of dynamo-electric machines



G. SCHROEDER.

VENTILATION 0F DYNAMO ELECTRIC MACHINES.

APPLICATION FILL!) NOV. 22, 1916.

1,335,129. Patented Mar. 30,1920.

2 SHEETS-SHEET 1.

WITNESSES:

INVENTORV TORNEY G. SCHROE'DER.

VENTILATION 0F DYNAMO ELECTRIC MACHINES.

APPLICATION FILED NOV.22, I9I6.

1,335, 1 29 Patented Mar. 30, 1920.

2 SHEETSSHEET 2.

WITNESSES: v INVENTOR fizz/i0 fi/z/"aedc r ATTORNEY STATES PATEN OFFICE.

ammo scnnonnnn, or HALE, ENGLAND, assrenon TO wnsmxivenousn ELECTRIC a mmurackrunme conmmr, A conronamon' or rmmsynvama,

vnmritn'rxon or nYnAxq-ELEcTRId macnmns.

To all whom it may concern:

Be it known that I, GIULIo SCHnoEDn a subject of the King of Italy, and a resident of Hale, in the county of Chester, England,

- larly to the ventilation of electric motors of have invented a new anduseful Improvement in Ventilation of Dynamo-Electric Machines, of which the following is a specification. h i

-My invention relates to the ventilation of dynamo-electric machines and particu- 'the inclosed type, such as railway and mill motors.

' It has heretofore been proposed to ventilate electric motors of the inclosed type by providing the relatively rotatable core mem-, here with longitudinal ducts extending therethrough and open to the atmosphere at both ends through which currents of air are forced by a suitablefan. In such a system of ventilation, the heat generated by the :I'notor windings is carried away by direct r 'diation from the surfaces of the windings fIflIldby the air currents passing through the longitudinal ducts in the core members, very little heatbeing radiated from the external surfaces of the motor casing. When motors of the above-described type areoperated in locations where moisture-or dirt enters the ventilatin openings, poor operating cond1-- tions resu t from thisforeign matter com- .ing into contact with the current-carrying parts and windings. Furthermore, with such a system of direct ventilation, "hot spots are liable to occur at those the air currents and, consequently, cannot be maintained at the relatively low tempera- .tures existing-in the ventilating ducts.

According to the present invention, I pro- ."vide a system'lof ventilation which is ar- ,ticularly adapted to be embodied in electric motors operating under conditionsin which it is desirable, or essential, to have the current-carrying parts entirely inclosed from the outside atmosphere. With'this end ducts which are arranged to'carry away-Q Y 1 H Asjthe amiature shaftitfrotates, the fan the heat that is radiated through the: moton.

casing, and I- fu'rthermore provide tora'ci'rculation of, air, in a closed path, wlthinth' motor casing thatall parts thereof "are; 'maintain'edat a substantially uniform tam-Y perature. I further provide a novel form of bafile plate within the motor casing by clearness.

partsof the motorwhicll are not directly reached by Specification of Letters Patent. Patented Mar. 30, 1920. Application filedlqovemher 22, 1916 Serial 116,132,778. I

of air therein In the accompanying drawing Figure 1 is a longitudinal sectional view of one half of a motor embodying my system of ventilation and Fig. 2 is a view taken in a plane extending perpendicularto that of Fig. 1, parts being broken away for the sake of Fig. 1 is a section the line II of Fig. 2. i

A frame 1 is provided with a plurality of radially projecting pole pieces 2 on which. are mounted field-magnet coils 3 that are disposed in sectlons, for a purpose to be hereinafter described. A An varmature core member 4 and a commutator cylinder 5 are taken along x carried by a shaft 6 that is rotatably.

mounted in suitable vbearings .7. The core member 4and, the commutator spider 8 are provided with longitudinal ducts 9.' Theframe '1 is provided with a plurality of spaced longitudinal ducts 10 located adja-.

cent to the. outer surface thereof. Endinclosing members 11 and 12 are secured to the ends of the frame 1, the member 11' being. provided with openings 13 located adjacent to the commutator cylinder 5 which are closed by air-tight covers '13. The end member 12 is provided withan opening 14 and spaced passages 15 that respectively communicate with the ducts 10.:

' An annular plate 16 is mounted on a collar 17 carried by the shaft 6 and entirely ing housing 7 and the innen -wall ofthe end member 12. The plate. 1 is provided on one side, with a plurality f fan blades closes the space between the right-hand bear- 18 that are located betweenth opening 14 and the passages 15.. The other slde'of the plate 16 is provided with a plurality offan. blades 19 that are located radially outside the to the pillar projections 2 and are located be tween portions of thedivided field-magnet "end turns of the armature I winding 20. Cylindrical baflle members 21 are securedv coils 3, the right-hand member being-adj'acentf to the inner portions of the fan bladesglt force air from the outside atmos-' here through the ducts w none of which, owever', enters the interior; of the motor casing. An independent circulation of air,

bafile-members 21 serve to direct the air into the spaces between the polar projections that are radially beyond them and in parallel paths through the longitudinal ducts 9 and into the spaces between the polar proj ections radially inside the bafile members.

From the foregoing, it is apparent that a substantially uniform temperature will be maintained within the motor casing by reason of the circulationof the air and that the radiation of heat from the exterior surfaces of the casing will be greatly increased by the passage of air currents through the ducts 10. Thus, the motor will be e fl ectively ventilated without the possibility of foreign substances entering the motor casing and impairing the operation thereof. It is also apparent that my invention may be as readily applied to dynamo-electric machines having cylindrical frames and in which spaces are provided between the frames and the core members carried thereby.

While I have shown my invention in a simple and preferred form, it is not so limited but is susceptible of various modific'a tions within the scope of the appendedclaims.

ll claim as my invention:

1. In a dynamo-electric machine, thecombination with relatively rotatable members, an inclosing casing therefor provided, at one end, with an opening and with longitudinal ducts communicating with said opening,

/ of a plate carried by the rotatable member within said opening and provided with fan blades for causing a circulation of air through said ducts and for causing an independentcirculation of air in a closed path within said casing.

2. In a dynamo-electric machine, the combination with relatively rotatable members, an inclosin casing thereforjprovided, at one end wit an opening, longitudinal ducts located adjacent to the exterior surface of said casing and other longitudinal ducts extending through said rotatable member,

of a device carried by the rotatable member for causing a circulation of air in independent paths through the ducts in the casing and through the ducts in the rotatable member, respectively.

3. In a dynamo-electric machine, the combination with relatively rotatable members, an inclosin one end, wit an opening, longitudinal ducts located adjacent to the exterior surface of said casing and other longitudinal ducts extending throughsaid rotatable member, of a device carried by the rotatable member for causing a circulation of air through theducts in the casing and for causing an independent circulation of air in a closed ath through the ducts in the rotatable mem; er.

4. In a d namo-electri'c machine, the combination with relatively rotatable members,

casing therefor. provided, at-

of means for entirely inclosing said members, the said means comprising a plate carried bythe rotatable member and provided with means for causing a circulation of air in a closed path within said casing. v

5. In a'dynamo-electric machine, the combination with stationary and rotatable mem bers, the rotatable members being provided with longitudinal ducts, of a casing for entirely inclosing said members, the said casing comprising a plate carried by the rotatable member and provided with blades for causing a circulation of air in-a closed 'path within said casing and including said ducts.

6. In a dynamo-electric machine, the combination with a stationary member comprising a frame provided with spaced radial projections and a rotatable member provided with longitudinal ducts, of a casing for entirely inclosing said members, the said casing comprising a plate carried by the rotatable member and provided with blades for causing a circulation of air in a. closed path within said casing and including said ducts.

7. In a dynamo-electric machine, the combination with a stationary member-comprising a frame provided with spaced radial projections and a rotatable member provided with longitudinal ducts and a casing for entirely inclosing said members, of a cylindrical baffle member carried by the stationar rotata le member for causing a circulation of air in a closed path within said casing and including the spaces between the radial projections on one side-of said bafiie. meifi her and the spaces between the projections on the other side of said bafile member and the said ducts. I a

8. A-dynamo-electric machine comprising member and a fan carried by the a stationary'member'provided with a plurality. of radial polar projections, divided 'field-magnet coils carried by each of said projections and a cylindrical baflie member carried by the said projections and located between portions of said coils.

9. Ina dynamo-electric machine, the eon 1- bination with relatively rotatable members,

a cooling system comprising a partially inclosed external circuit and a totally inclos'ed internal circuit, of an inclosing casing for said members provided with an opening,

and a plate mounted on said rotatable-memsubscribed my name this 25th day of October, 1916.

GIULIU SCHROEDER. -Witnesses:

FREDER CK Nixon, J S. Peon,

have hereunto: 

